diff --git a/website/docs/api/top-level.mdx b/website/docs/api/top-level.mdx
index 975c16aaa48..6de1acdf079 100644
--- a/website/docs/api/top-level.mdx
+++ b/website/docs/api/top-level.mdx
@@ -25,7 +25,10 @@ and call the package's own `load()` method. If a pipeline is loaded from a path,
 spaCy will assume it's a data directory, load its
 [`config.cfg`](/api/data-formats#config) and use the language and pipeline
 information to construct the `Language` class. The data will be loaded in via
-[`Language.from_disk`](/api/language#from_disk).
+[`Language.from_disk`](/api/language#from_disk). Loading a pipeline from a
+package will also import any custom code, if present, whereas loading from a
+directory does not. For these cases, you need to manually import your custom
+code.
 
 <Infobox variant="warning" title="Changed in v3.0">
 
diff --git a/website/docs/usage/training.mdx b/website/docs/usage/training.mdx
index 6cda975cb14..6caf2e94bd3 100644
--- a/website/docs/usage/training.mdx
+++ b/website/docs/usage/training.mdx
@@ -758,6 +758,15 @@ any custom architectures, functions or
 your pipeline and registered when it's loaded. See the documentation on
 [saving and loading pipelines](/usage/saving-loading#models-custom) for details.
 
+<Infobox variant="warning">
+
+Note that the unpackaged models produced by `spacy train` are data directories
+that **do not include custom code**. You need to import the code in your script
+before loading in unpackaged models. For more details, see
+[`spacy.load`](/api/top-level#spacy.load).
+
+</Infobox>
+
 #### Example: Modifying the nlp object {id="custom-code-nlp-callbacks"}
 
 For many use cases, you don't necessarily want to implement the whole `Language`